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由 David Heinemeier Hansson 提交于
Added FormHelper#form_for and FormHelper#fields_for that makes it easier to work with forms for single objects also if they don't reside in instance variables [DHH] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3003 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
947cec29
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